Blast-furnace tuyere



Nov; 25, 1924.

G BEATO N BLAST FURNACE T'UYERE Filed June 50.41923 JILL-N101? No).2s-Q1924.

G. BEATON BLAST FURNACE TUYERE 2 Sheeis-Sheei 2 Filed June so, 1923 I.ZMJENTDR EEUREE BEfiTuNr I Patented Nov. 1924.

amas,

PATENT ori ice..."

GEORGE BEATON, F SYDNEY, NOVA SGOTIA, CANADA.

BLAST-FURNACE Application filled June so, 1923. Serial no. 648,736.

To all whom it may concern:

Be it known that I. Gnoncn BEATON, a subject of the King of GreatBritain, and resident of Sydney, in the Province of Nova Scotia,Dominion of Canada, have invented certain new and useful Improvements inBlast-Furnace Tuyeres, of which the following is a specification.

' This invention relates toimnrovement's in blast furnace tuyeres, andhas for its primary object to provide a tuyere nose carrying a coveringof refractory material. I

Further objects are to provide a tuyere nose which is to be providedwith a protector of refractory material at the lower side, which isnearest to the hearth of the furnace. Other objects also are to providea tuyere which will have its nose provided with an annular covering ofrefractory material designed to replace the old styleof tnyeres, whichwereburning on the upper and lower edge of the nozzle.

A further object is the provision of a tuyere for blast furnaces thatwill not quickly burn up and thus obviate the necessity of having,as'isthe case with tuyeres at present in use, to frequently shut oif theblast for ten or fifteen minutes while a burnt out tuyere is beingreplaced. It is a known fact that in blast furnaces a great number oftuyeres are burnt up-even in the space of a month under presentconditions, and to remedy this frequent replacing of tuyeres is anessential object of my invention.

out per week, so that the invention has a decided effect on theefliciency of the furnace,

the cost of running of which is considerably lowered. v f

Further objects are to provide an improved blast furnace tuyere that issimple in construction, not liable to go out of repair, and generally toadapt the several parts to better perform the functions required ofthem.

In the drawings Figure 1 is a plan view of the improved tuyere.

Figure 2 is a longitudinal section.

Figure 3 is a longitudinal section through a somewhat modified form oftuyere.

Figure 4 is a bottom plan V ew of the tuyere.

Figure 5 is a bottom plan view of the tuyere shown inFigure 3.

view taken on the line 6-6 of Figure 1. Figure 7 is a plan view of analternative form of tuyere. A

Figure 8 is a longitudinal section.

Figure 9 is a longitudinal section showing an annular refractory block.

Figure 6 is an enlarged sectional detail Figure 10 is a bottom plan viewof the Y tuyere shown in Fi re 8.

Figure 11 is a bottom. plan view of the tuyere shown in Fi re 9.

Like characters 0 reference indicate corresponding parts in all thefigures.

Referring more in particular to drawings for a detailed description, Arepresents the tuyere, which maybe cast of any suitable metal, and isof' the usual construction, comprising the tapering cylindrical body 10formed with the annular water 'acket 11. A water inlet 12 and a waterout et 13 are provided, as shown in Figures 1 and 7.

. Connected to the water inlet 12 is a metallic pipe 14, which is coiledwithinv the annular jacket 11, and leads the water to the inner part ofthe tuyere.

The tuyere nose 15 is cored out as at 16 in order to form an arcuaterecess on the side of thetuyere, which is to be lowermost in thefurnace, and nearest the hearth. This particular construction isdesigned to replace the old style of tuyere, which were burning on thelower edge of the nozzle. Only one of the improved tuyeres is burnt Inorder to protect the ti1yere,-a filling of refractorymaterial 17 isplaced within the recess 16, and the refractory material may be securelyheld within the recess by means of dove-tailed projections'or studs 18pro vided in the bottom of the recess.

In order toplace this refractory material within the recess, the tuyerenose is cored as already explained in order .to provide the recess 16,and the refractory is rammed within the'recess as hard as possible. The

tuyere is then placed nose down on a smooth plate and left in anordinary foundry core oven for a period of about forty-eight hours,

more or less. The thin ring of metal left on the outside diameter of thenose will protect the refractory from abuse in shipping and roughhandling at the f ace. I

In case a vitrified refractoryis used, it can 'these slots cored in thethin from shrinking by casting narrow slots 1n f the thin ring of metalas shown at 19 in Figures 2m 5 inclusive. In other words, metal aroundthe nose are. designed to prevent the tearing of the casting whileshrinking on the hard reborundum cements, etc.

- silicon carbide,

fractory core.

' The refractory may be any material such as carborundum, carbon,refrax, silfrax, carbofrax, silica, dolomite, lime, fireclay, crome,zirconia, magnesia, beuite, quarzite or any used singly or mixed withanotheran bondin'gmaterialwhatsoever such as; tar, pitch, refractoryclay and sodium silicate, car- So far the best refractory obtained hasbeen made by a mixture of. ma'gnesiabonded with carborundum cement.

. With reference to the composition of the 'materials above referred to,refrax and silfrax are two products made by a special process ofrecrystallization and are com-. posed wholly of carborundum, held insolid form by the interlocking and intersgrowthof silicon carbideferences between these two crystals.

roducts is in the size of the crystalline particles, silfrax beingcomposed of extremely fine carborun dum powder and refrax of coarserarticles. v Refrax is composed wholly of carborundum held 'to ether bycrystallization and, therefore, 5 as the properties of unaltered by anybonding agent. e

Oarbofrax may be termed the best known type of carborundum refractoryand 1s composed of crystals of silicon carbide held together by a smallpercentage of a bonding refractory material. Three varities of this typeare produced and knownas carbofrax has most .carborundum itself.

into more or less intricate for s clal applications.

carbofrax A, carbofrax B and carbofrax C. Carbofrax is made not onl instandard refractory shapes but also mou ded forms as required smalamount of bonding material used, of the properties of Creme analyzes asfollows Iron peroxide 17:5 Silica; i 3. 25

follows:

Percent. Silica 4to7 3 :Iron peroxide 3to5 Alumina 90 In order toreplace .a tuyere which burns onboth the top and bottom, the cored outbonded with any The chief dif- On account of the.

cess inthe nose,

is a hydrousoxide jacket in the body recess 16 may be in the form shownat 20 orming an annular recess having an inclined bottom 21, so thataheavier thickness of refractory may be placed at the bottom, which isnearest the hearth of the furnace, than at the top, which the tuyeretense..

If desired also, the means of retaining the refractory within the recessinstead of comprising studs as shown. in Figures 2 to 5, may consist ofdove-tailed transverse ieces or projections 22, which extend ra iallywithin the recess 20.

It be obvious that this improved tuyere has considerable advantages overthe metallic tuyere now used, and that. havingl an average life oftwelve weeks as compare to the exceedingly shorter life of. the presenttuyere, which is day, it will have a decided effect on the efficiency ofthe furnace, since the blast not being taken off so often, thetemperature will be kept up better than result that the output of thefurnace will be greater.

As many-changes could be made in the above construction, and manyapparently widely different embodiments of is submitted is not soinstructed without departing from the spirit or scope thereof, it isintended that all matter contained in the accompgnying specification anddrawings shall interpreted as illustrative, and not in a limiting sense.

What I claim as my invention is:

.1. A blast furnace tuyere com rising a cylindrical body rtion, an emjacket in the b y portion, the body portion being formed with a coredout recess in the nose, and. a filling of refractory material 'in'therecnose. I

2. A blast furnace 'tuyere com rising a lagket in the body portion,

g formed withacored I cess 1n the nose,'and a filling of refractorymaterial intherecessed nose. v

3. A blast furnace cylindrical bodyportion, an 'annu ar water the bodyportion eing formed with a recessed nose."

burnt at therate of 10 a heretofore, with the my inven-- tion, withinthe scope of the claims, con-.

where the temperature to I r water cylindrical body portion,an annu arwater out annular retuyere com v =116 acket in'the' body portion, thebody portion cored out annular ref x the bottom of the recessi beinginclined, and 'a of refractorymaterial in the 120 cylindrical bodyportion, an aim ar'water Locket in the body rtion, the nose of the 0113portion being furnace, and a filling of refractory material In therecess. 7 Y

5. A blast furnace tuyere com rising a cylindrical body portion, an an rwater ormed with a recess on the side to be nearest the health of thertion, the body portion 18c nose being formed with an annular recess,

and a filling of refractory material in the recess, the refractory beingheavier on the side nearest the hearth ofthe furnace.

6. A blast furnace tuyere com rising a cylindrical body ortion, an annuar water jacket in the body portion, a spiral ty within the waterjacket, conducting t e 7 water to the hotted part of the tuyere, the

'fractory material in t e recessed and subjecting the core to a bakingtreatment for a predeterminedperiod the weight of the tuyere beingutilized to retain the .rammed refractory in a solid body.

8. A blast furnace tuyere comprising a cylindrical body ortion,anannular'water jacket inthe b y portion, the body portion nose beingformed with a recess, a filling of refractory material in the recess,the recess walls being slotted, as and for they purpose slpecified.

9 A b ast furnace tuyere coin using a cylindrical body portion, an annuar water so jwcket in the body portion, the body portion 7 ing formedwith a cored out recess in the nose, afilling of refractory material inthe recessed nose, and a plurallty of dove-tailed projections cast inthe bottom of the recess to. retain the refractory.

10. A blast furnace tuyere com rising a cylindrical body portion, anannu ar water jacket in the body portion, a spirally wound pipe in thejacket, the body portion nose 40 being formed with an annular recess,dovetailedprojections in thebottom of the recess, and a filling ofrefracto material retained in the recess by the pro ections.

In witness whereof I have hereunto'set 45 my hand in the-presence of twowitnesses.

p GEORGE BEMIION. Witnesses:

- Tnos'. H. Ifi'rormrr, Pa'mRMAoAmr.

